they dont fail very often. high mileage trucks that havent ran the coolant additive are the usual suspects. when i worked for the dealership i only replaced 1 set, the truck had over 350k and the coolant had never been changed accordint to the owner

its an additive that is supposed to eliminate electrolysis and cavitation. available at your dealer for a few bucks. reccomended to be added every 50k. there should be info about it in your owners manual.

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